Fixed lost sender issue.

src/field.rs

@@ -1,8 +1,5 @@
 use crate::queue::Message;
-use std::{
-    fmt,
-    sync::mpsc::Sender,
-};
+use std::{fmt, sync::mpsc::Sender};
 use uuid::Uuid;
 
 #[derive(Clone, Debug)]
@@ -65,8 +62,8 @@ impl fmt::Display for Field {
 
 #[cfg(test)]
 mod fields {
-    use std::sync::mpsc::channel;
     use super::*;
+    use std::sync::mpsc::channel;
 
     #[test]
     fn string_to_field() {
@@ -128,7 +125,7 @@ mod fields {
                 let msg = Message::new();
                 sender.send(msg).unwrap();
                 rx.recv().unwrap();
-            },
+            }
             _ => unreachable!("should have been a sender"),
         }
     }